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Mitigation of this Issue would include careful well development to remova the sand and resettle the filter pack and
<br />modification of pumping operations to reduce sharp changes in water velocity that mobilize fine-grained aquifer sand.
<br />Prior to redevelopment it Is recommended to review of the factors that can cause this reduction In specific capacity.
<br />The review would include assessment of biological and cementation plugging and review the original, well construction
<br />documents Including the sleve analysis performed to size the filter pack and the dally construction of available). As part of
<br />developing a mitigation approach, spinner togs may be recommended to verify production zones.
<br />Environmental Studies, Our environmental services team provides oompleta natural resource regulatory compliance
<br />services for publieworks projects, Our environmental professionals have provided services for a wide variety of projects,
<br />including roadway, transit, transportation planning, green streets, complete streets, land development, storm draln,
<br />and water resources, They are well versed in all aspects of the development process from Phase I Environmental
<br />SlteAssessmonts to California Environmental Quality Act (CERA) and National Environmental PalicyAct (NEPA)
<br />Kimlley> Horn a 7ROO77029,Y71city orSanta Am
<br />25E-23
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<br />Water Improvement Design and Coordination. Our utilltq.dasignteam along with our suboonsultant, Hazen and
<br />Sawyer have. successfully completed water Infrastructure projects for various agencies in Southern California. These'y
<br />projects consist Of water main replacement, realignment, upsizing and capacity Increase, master planning, existing
<br />system evaluation and maintenance and operational support, Although each project is unique, the majority of cholionglog
<br />Utility projects we face Oro In developed areas where existing Utility facilities are located within the proposed project area
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<br />and any Improvement will generally effector be affected by the location of theoxisting utility, facllity, k1mley-Morn believes
<br />In drawing all utility tines and features true to size in our Mons to aid in Identifying conflicts early in the design phase. We
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<br />will also pothole potential conflict locations when budgets allow,, which gives a better understanding of the locations of
<br />the existing lines, and provide extensive o0ordinatioh.with the Vatlous utility companies. We also use M modeling of
<br />ulifltles to identify potential conflicts In,early stages of design,•This'iuethodtiao helped us to avoid discrapandea between
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<br />construotion documonts'and actual field conditions that resulted In cost effective and fimoly manner oncullon of projects,
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<br />Sanitary Sewer Design. Sowers will. be designed based on Cranga County Sanitetictt District and City of Santa Ana's
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<br />requirements, All design criteria will be reviewed versus the previous requirements including sewer pipe alzing, modeling
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<br />and analyals, sewer line alignment and depth, minimum slopes,, plpa.materials, bedding and tronch design, and raqulred.
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<br />manholes. Kimley«Ham will provide modeling based on assembled Information based on the existing system.and
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<br />incorporating proposed.conditlons If requested by ihs Oily, Results of the modeling and recommendations by kimley-Horn
<br />for project solutions will then be submitted to the City for review and approval.
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<br />Well Rehabilitation Design. A combination of three factors can cause water production decline. The first is a regional
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<br />decline In water elevations that shift the "static" water level downward. The second Is a decline In water levels In the
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<br />local aquifer caused by continuous pumping. The third Is a decline In specific capacity caused by plugged filter pack
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<br />or well screen. The regional doollne In water levels Is not controllable and groundwater levels will recover through
<br />natural recharge. The reduction in specific capacity requires corrective motion In the form of root cause evaluation, well
<br />redevelopment, and possibly modification to pump location and flow rate.
<br />The decline In specific capacity could be a -result of a reduction of permeability near the well screen. This type of
<br />permeability reduction is often the result of biological fouling, cementation, or the intrusion of foe -grained aquifer sand
<br />into the gravel pack surrounding the well casing. Well videos could confirm this.: Migration of fine-grained aquifer sand
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<br />could be a root cause of the rapid decline In specific capacity. The result of this is that water velocity during pumping is
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<br />much higher In those sections of screen that produce the most water. During pumping, small sand particles mobilize and
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<br />migrate through the well filter pack and wedge Into the pore space, reducing permeability in the filler pack.
<br />Mitigation of this Issue would include careful well development to remova the sand and resettle the filter pack and
<br />modification of pumping operations to reduce sharp changes in water velocity that mobilize fine-grained aquifer sand.
<br />Prior to redevelopment it Is recommended to review of the factors that can cause this reduction In specific capacity.
<br />The review would include assessment of biological and cementation plugging and review the original, well construction
<br />documents Including the sleve analysis performed to size the filter pack and the dally construction of available). As part of
<br />developing a mitigation approach, spinner togs may be recommended to verify production zones.
<br />Environmental Studies, Our environmental services team provides oompleta natural resource regulatory compliance
<br />services for publieworks projects, Our environmental professionals have provided services for a wide variety of projects,
<br />including roadway, transit, transportation planning, green streets, complete streets, land development, storm draln,
<br />and water resources, They are well versed in all aspects of the development process from Phase I Environmental
<br />SlteAssessmonts to California Environmental Quality Act (CERA) and National Environmental PalicyAct (NEPA)
<br />Kimlley> Horn a 7ROO77029,Y71city orSanta Am
<br />25E-23
<br />
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